ICD-11 code : 8C71.5;
Preferred Label : Pseudomyotonia;
ICD-11 definition : The term pseudomyotonia (slow relaxation of muscles after voluntary contraction) describes
the clinical appearance of myotonia in the absence of myotonic discharges on the electromyography.
Pseudomyotonia is most commonly observed as the slow-relaxing or hung-up tendon reflexes
of hypothyroidism, although other causes are described. Pseudomyotonia is seen in
about one-third of patients with Isaacs syndrome, particularly with handgrip, but
also after eye and jaw closure; rarely, this can be the first symptom.;
Origin ID : 715714152;
Automatic exact mappings (from CISMeF team)
- ICD-10 Mapping
The term pseudomyotonia (slow relaxation of muscles after voluntary contraction) describes
the clinical appearance of myotonia in the absence of myotonic discharges on the electromyography.
Pseudomyotonia is most commonly observed as the slow-relaxing or hung-up tendon reflexes
of hypothyroidism, although other causes are described. Pseudomyotonia is seen in
about one-third of patients with Isaacs syndrome, particularly with handgrip, but
also after eye and jaw closure; rarely, this can be the first symptom.
